COMPONENT
WXT520
Weather Transmitter
Overview
The WXT520 Weather Transmitter, manufactured
by Vaisala, measures wind speed and direction,
precipitation, barometric pressure, temperature, and
relative humidity - all in a single device that has no
moving parts. The WXT520 outputs an SDI-12 signal
that can be measured by many of our dataloggers.
The WXT520 is about the size of a larger Gill radiation
shield, making it ideal for use with our CR200-series
dataloggers in applications requiring quick, shortterm deployment. However, the WXT520 is not
intended for weather stations that require researchgrade performance.
Wind Speed and Direction
The WXT520’s wind sensor consists of three equally
spaced transducers that produce ultrasonic signals.
Wind speed and direction are determined by
measuring the time it takes for the ultrasonic signal
of one transducer to travel to the other transducers.
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More info: +44(0) 1509 828 888
Weather Transmitter
Single device that measures
wind speed & direction,
precipitation,
barometric pressure,
temperature and relative humidity
Bene ts and Features
Single device that measures wind speed and direction,
precipitation, barometric pressure, temperature and relative
humidity
No moving parts
Ideal for use with CR200-series dataloggers
Housed in radiation shield that protects the unit and re ects
solar radiation
An optional bird spike kit can be added to discourage birds
from roosting without harming the birds and with minimal
interference to performance
Precipitation
Precipitation is measured one raindrop at a time.
Whenever a raindrop hits the precipitation sensor, an
electrical signal is produced that is proportional to the
volume of the drop. From this signal, precipitation is
calculated.
Barometric Pressure, Temperature, and Relative
Humidity (RH)
The WXT520 has a PTU module that contains a capacitive
silicon BAROCAP® sensor for barometric pressure
measurements, a capacitive ceramic THERMOCAP® sensor
for air temperature measurements, and a capacitive thin
lm polymer HUMICAP® sensor for relative humidity
(RH) measurements. The PTU is housed in a naturallyaspirated radiation shield that protects the PTU and
re ects solar radiation.
Mounting
A simple mounting tube is available for the WXT520. The
mounting tube fastens to a CM202, CM204, or CM206
crossarm via a 008285 NU-RAIL tting.
The #25299 is an optional mounting kit for the WXT520.
It provides better water protection. When using the
#25299, the WXT520’s IP classi cation is IP66; otherwise
its classi cation is IP65. The #25299 fastens to a crossarm
via the 008285 NU-RAIL tting.
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Campbell Scienti c
January 28, 2013
Wind speed
Measurement Range: 0 to 60 m s
-1
Response Time: 0.25 s
Accuracy: ±3% at 10 m/s
Wind Direction
Measurement Range: 0° to 360°
Response Time: 0.25 s
Accuracy: ±3°
Output Resolution: 1°
Precipitation
Rainfall Measurement: Cumulative accumulation after latest
automatic or manual reset.
Collecting Area: 60 cm
2
Output Resolution: 0.01 mm (0.001”)
Field Accuracy for Daily Accumulation:
Better than 5% (weather dependent); due to the nature of the
phenomenon, deviations caused by spatial variations may exist in
precipitation readings, especially in short time scale. The accuracy
speci cation does not include possible wind induced error.
Rain Duration: Counting each 10-s increment whenever droplet
detected.
Rain Intensity: 1-min. running average in 10-s steps.
Rain Intensity Range: 0 to 200 mm hr
-1
(broader range possible with
reduced accuracy)
Air Temperature
Measurement Range: -52° to +60°C
Accuracy: ±0.3°C @ +20°C
Output Resolution: 0.1°C
Barometric Pressure
Measurement Range: 600 to 1100 hPa
Accuracy: ±0.5 hPa @ 0° to 30°C; ±1 hPa @ -52° to +60°C
Output Resolution: 0.1 hPa
Relative Humidity
Measurement Range: 0 to 100% RH
Accuracy: ±3% RH @ 0 to 90% RH; ±5% RH @ 90 to 100% RH
Output Resolution: 0.1% RH
Assembly
Electromagnectic Compatibility
Complies with EMC standard EN61326-1;
IEC standards: IEC 60945/61000-4-4, IEC 60945/61000-4-2
Input Voltage: 5 to 30V DC (below 5.3V the measurement
performance for high wind speeds may be degraded)
Typical Current Drain @ 12V DC:
0.1 mA (SDI-12 standby)
3 mA (default measuring intervals)
Output: SDI-12
Compatible Dataloggers: CR200-series, CR800, CR850, CR1000,
CR3000, CR5000, CR510, CR10(X), CR23X
Operating Range: -52° to +60°C; 0 to 100% RH
Storage Temperature Range: -60° to +70°C
Height: 23.8 cm (9.38”)
Diameter: 11.5 cm (4.52”)
Weight: 650 g (1.43 lbs)
Speci cations
Ordering Information
WXT520 Vaisala Weather Sensor (requires a sensor cable; see options below)
-2 2 m Sensor Cable
-10 10 m Sensor Cable
Accessories
008285 NU-RAIL. Fitting for mounting the WXT520 to a crossarm, such as a CM202, CM204, or CM206.
#25299 Optional WXT520 IP66 Mounting Kit
#25300 Bird Spike Kit for the WXT520 Radiation Shield that houses the temperature, RH, and barometric pressure sensors.
Bird Spike Kit
The #25300 Bird Spike Kit is used to discourage birds from
roosting on the WXT520. This kit is fastened on top of the
WXT520. It consists of a metallic band with spikes pointing
upward. The spike’s shape and location ensure minimal
interference of wind and rain measurements. The spikes are
designed not to hurt the birds. Please note that when the
kit is attached to the WXT520, more snow can accumulate
on the WXT520, and the snow may melt slower.
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